. and then there was the security we could not see. >> the big differences are things we're not going to go into. we've introduced some real good technology things here. so the strongest security is the security you don't see. >> reporter: this was the first major event in d.c. since the killing of osama bin laden. recently homeland security warned of al qaeda chatter about attacks on dates symbolic to americans. there were no major incidents monday. the stepped up security did not seem to bother anyone here. the kids danced, and some even reflected on what the day is really about. >> it's the time how we got our freedom from the british people. >> it's to celebrate america. >> reporter: and what a celebration it was. park police said everyone seemed to be well behaved. there were only five arrests. d.c. fire and ems said their day was also manageable. from the washington monument, craig melvin, "news 4 today." >> the first family watched the fireworks display in the company of the men and women of the military and their families. they thanked them for their work and promised the full support of the nation. >> i'